Added the names of all the currently known projects to the configuration.

So that the same code could possibly be cherry-picked back into 21.0 without
having to set up a separate MR for that.

Projects/WorkDir/CMakeLists.txt

@@ -14,7 +14,8 @@ find_package( AtlasCMake QUIET )
 # Try to figure out what project is our parent. Just using a hard-coded list
 # of possible project names. Basically the names of all the other
 # sub-directories inside the Projects/ directory in the repository.
-set( _parentProjectNames Athena AnalysisBase )
+set( _parentProjectNames Athena AthenaP1 AnalysisBase AthAnalysisBase
+   AthSimulation )
 set( _defaultParentProject Athena )
 set( _defaultUseFortran TRUE )
 foreach( _pp ${_parentProjectNames} )